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-rw-r--r--source3/auth/auth.c550
1 files changed, 550 insertions, 0 deletions
diff --git a/source3/auth/auth.c b/source3/auth/auth.c
new file mode 100644
index 0000000000..754cb7a508
--- /dev/null
+++ b/source3/auth/auth.c
@@ -0,0 +1,550 @@
+/*
+ Unix SMB/CIFS implementation.
+ Password and authentication handling
+ Copyright (C) Andrew Bartlett 2001-2002
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+static_decl_auth;
+
+static struct auth_init_function_entry *backends = NULL;
+
+static struct auth_init_function_entry *auth_find_backend_entry(const char *name);
+
+NTSTATUS smb_register_auth(int version, const char *name, auth_init_function init)
+{
+ struct auth_init_function_entry *entry = backends;
+
+ if (version != AUTH_INTERFACE_VERSION) {
+ DEBUG(0,("Can't register auth_method!\n"
+ "You tried to register an auth module with AUTH_INTERFACE_VERSION %d, while this version of samba uses %d\n",
+ version,AUTH_INTERFACE_VERSION));
+ return NT_STATUS_OBJECT_TYPE_MISMATCH;
+ }
+
+ if (!name || !init) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ DEBUG(5,("Attempting to register auth backend %s\n", name));
+
+ if (auth_find_backend_entry(name)) {
+ DEBUG(0,("There already is an auth method registered with the name %s!\n", name));
+ return NT_STATUS_OBJECT_NAME_COLLISION;
+ }
+
+ entry = SMB_XMALLOC_P(struct auth_init_function_entry);
+ entry->name = smb_xstrdup(name);
+ entry->init = init;
+
+ DLIST_ADD(backends, entry);
+ DEBUG(5,("Successfully added auth method '%s'\n", name));
+ return NT_STATUS_OK;
+}
+
+static struct auth_init_function_entry *auth_find_backend_entry(const char *name)
+{
+ struct auth_init_function_entry *entry = backends;
+
+ while(entry) {
+ if (strcmp(entry->name, name)==0) return entry;
+ entry = entry->next;
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Try to get a challenge out of the various authentication modules.
+ Returns a const char of length 8 bytes.
+****************************************************************************/
+
+static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
+{
+ DATA_BLOB challenge = data_blob_null;
+ const char *challenge_set_by = NULL;
+ auth_methods *auth_method;
+ TALLOC_CTX *mem_ctx;
+
+ if (auth_context->challenge.length) {
+ DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
+ auth_context->challenge_set_by));
+ return auth_context->challenge.data;
+ }
+
+ auth_context->challenge_may_be_modified = False;
+
+ for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
+ if (auth_method->get_chal == NULL) {
+ DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
+ continue;
+ }
+
+ DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
+ if (challenge_set_by != NULL) {
+ DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
+ challenge_set_by, auth_method->name));
+ continue;
+ }
+
+ mem_ctx = talloc_init("auth_get_challenge for module %s", auth_method->name);
+ if (!mem_ctx) {
+ smb_panic("talloc_init() failed!");
+ }
+
+ challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
+ if (!challenge.length) {
+ DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
+ auth_method->name));
+ } else {
+ DEBUG(5, ("auth_get_challenge: successfully got challenge from module %s\n", auth_method->name));
+ auth_context->challenge = challenge;
+ challenge_set_by = auth_method->name;
+ auth_context->challenge_set_method = auth_method;
+ }
+ talloc_destroy(mem_ctx);
+ }
+
+ if (!challenge_set_by) {
+ uchar chal[8];
+
+ generate_random_buffer(chal, sizeof(chal));
+ auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
+ chal, sizeof(chal));
+
+ challenge_set_by = "random";
+ auth_context->challenge_may_be_modified = True;
+ }
+
+ DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
+ DEBUG(5, ("challenge is: \n"));
+ dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
+
+ SMB_ASSERT(auth_context->challenge.length == 8);
+
+ auth_context->challenge_set_by=challenge_set_by;
+
+ return auth_context->challenge.data;
+}
+
+
+/**
+ * Check user is in correct domain (if required)
+ *
+ * @param user Only used to fill in the debug message
+ *
+ * @param domain The domain to be verified
+ *
+ * @return True if the user can connect with that domain,
+ * False otherwise.
+**/
+
+static bool check_domain_match(const char *user, const char *domain)
+{
+ /*
+ * If we aren't serving to trusted domains, we must make sure that
+ * the validation request comes from an account in the same domain
+ * as the Samba server
+ */
+
+ if (!lp_allow_trusted_domains() &&
+ !(strequal("", domain) ||
+ strequal(lp_workgroup(), domain) ||
+ is_myname(domain))) {
+ DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
+ return False;
+ } else {
+ return True;
+ }
+}
+
+/**
+ * Check a user's Plaintext, LM or NTLM password.
+ *
+ * Check a user's password, as given in the user_info struct and return various
+ * interesting details in the server_info struct.
+ *
+ * This function does NOT need to be in a become_root()/unbecome_root() pair
+ * as it makes the calls itself when needed.
+ *
+ * The return value takes precedence over the contents of the server_info
+ * struct. When the return is other than NT_STATUS_OK the contents
+ * of that structure is undefined.
+ *
+ * @param user_info Contains the user supplied components, including the passwords.
+ * Must be created with make_user_info() or one of its wrappers.
+ *
+ * @param auth_context Supplies the challenges and some other data.
+ * Must be created with make_auth_context(), and the challenges should be
+ * filled in, either at creation or by calling the challenge geneation
+ * function auth_get_challenge().
+ *
+ * @param server_info If successful, contains information about the authentication,
+ * including a struct samu struct describing the user.
+ *
+ * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
+ *
+ **/
+
+static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
+ const struct auth_usersupplied_info *user_info,
+ struct auth_serversupplied_info **server_info)
+{
+ /* if all the modules say 'not for me' this is reasonable */
+ NTSTATUS nt_status = NT_STATUS_NO_SUCH_USER;
+ const char *unix_username;
+ auth_methods *auth_method;
+ TALLOC_CTX *mem_ctx;
+
+ if (!user_info || !auth_context || !server_info)
+ return NT_STATUS_LOGON_FAILURE;
+
+ DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
+ user_info->client_domain, user_info->smb_name, user_info->wksta_name));
+
+ DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
+ user_info->domain, user_info->internal_username, user_info->wksta_name));
+
+ if (auth_context->challenge.length != 8) {
+ DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ if (auth_context->challenge_set_by)
+ DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
+ auth_context->challenge_set_by));
+
+ DEBUG(10, ("challenge is: \n"));
+ dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
+
+#ifdef DEBUG_PASSWORD
+ DEBUG(100, ("user_info has passwords of length %d and %d\n",
+ (int)user_info->lm_resp.length, (int)user_info->nt_resp.length));
+ DEBUG(100, ("lm:\n"));
+ dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
+ DEBUG(100, ("nt:\n"));
+ dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
+#endif
+
+ /* This needs to be sorted: If it doesn't match, what should we do? */
+ if (!check_domain_match(user_info->smb_name, user_info->domain))
+ return NT_STATUS_LOGON_FAILURE;
+
+ for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
+ NTSTATUS result;
+
+ mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
+ user_info->domain, user_info->smb_name);
+
+ result = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
+
+ /* check if the module did anything */
+ if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_NOT_IMPLEMENTED) ) {
+ DEBUG(10,("check_ntlm_password: %s had nothing to say\n", auth_method->name));
+ talloc_destroy(mem_ctx);
+ continue;
+ }
+
+ nt_status = result;
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] succeeded\n",
+ auth_method->name, user_info->smb_name));
+ } else {
+ DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
+ auth_method->name, user_info->smb_name, nt_errstr(nt_status)));
+ }
+
+ talloc_destroy(mem_ctx);
+
+ if ( NT_STATUS_IS_OK(nt_status))
+ {
+ break;
+ }
+ }
+
+ /* successful authentication */
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ unix_username = (*server_info)->unix_name;
+ if (!(*server_info)->guest) {
+ /* We might not be root if we are an RPC call */
+ become_root();
+ nt_status = smb_pam_accountcheck(unix_username);
+ unbecome_root();
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] succeeded\n",
+ unix_username));
+ } else {
+ DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] FAILED with error %s\n",
+ unix_username, nt_errstr(nt_status)));
+ }
+ }
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG((*server_info)->guest ? 5 : 2,
+ ("check_ntlm_password: %sauthentication for user [%s] -> [%s] -> [%s] succeeded\n",
+ (*server_info)->guest ? "guest " : "",
+ user_info->smb_name,
+ user_info->internal_username,
+ unix_username));
+ }
+
+ return nt_status;
+ }
+
+ /* failed authentication; check for guest lapping */
+
+ DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
+ user_info->smb_name, user_info->internal_username,
+ nt_errstr(nt_status)));
+ ZERO_STRUCTP(server_info);
+
+ return nt_status;
+}
+
+/***************************************************************************
+ Clear out a auth_context, and destroy the attached TALLOC_CTX
+***************************************************************************/
+
+static void free_auth_context(struct auth_context **auth_context)
+{
+ auth_methods *auth_method;
+
+ if (*auth_context) {
+ /* Free private data of context's authentication methods */
+ for (auth_method = (*auth_context)->auth_method_list; auth_method; auth_method = auth_method->next) {
+ TALLOC_FREE(auth_method->private_data);
+ }
+
+ talloc_destroy((*auth_context)->mem_ctx);
+ *auth_context = NULL;
+ }
+}
+
+/***************************************************************************
+ Make a auth_info struct
+***************************************************************************/
+
+static NTSTATUS make_auth_context(struct auth_context **auth_context)
+{
+ TALLOC_CTX *mem_ctx;
+
+ mem_ctx = talloc_init("authentication context");
+
+ *auth_context = TALLOC_P(mem_ctx, struct auth_context);
+ if (!*auth_context) {
+ DEBUG(0,("make_auth_context: talloc failed!\n"));
+ talloc_destroy(mem_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+ ZERO_STRUCTP(*auth_context);
+
+ (*auth_context)->mem_ctx = mem_ctx;
+ (*auth_context)->check_ntlm_password = check_ntlm_password;
+ (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
+ (*auth_context)->free = free_auth_context;
+
+ return NT_STATUS_OK;
+}
+
+bool load_auth_module(struct auth_context *auth_context,
+ const char *module, auth_methods **ret)
+{
+ static bool initialised_static_modules = False;
+
+ struct auth_init_function_entry *entry;
+ char *module_name = smb_xstrdup(module);
+ char *module_params = NULL;
+ char *p;
+ bool good = False;
+
+ /* Initialise static modules if not done so yet */
+ if(!initialised_static_modules) {
+ static_init_auth;
+ initialised_static_modules = True;
+ }
+
+ DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
+ module));
+
+ p = strchr(module_name, ':');
+ if (p) {
+ *p = 0;
+ module_params = p+1;
+ trim_char(module_params, ' ', ' ');
+ }
+
+ trim_char(module_name, ' ', ' ');
+
+ entry = auth_find_backend_entry(module_name);
+
+ if (entry == NULL) {
+ if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
+ entry = auth_find_backend_entry(module_name);
+ }
+ }
+
+ if (entry != NULL) {
+ if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
+ DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
+ module_name));
+ } else {
+ DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
+ module_name));
+ good = True;
+ }
+ } else {
+ DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
+ }
+
+ SAFE_FREE(module_name);
+ return good;
+}
+
+/***************************************************************************
+ Make a auth_info struct for the auth subsystem
+***************************************************************************/
+
+static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
+{
+ auth_methods *list = NULL;
+ auth_methods *t = NULL;
+ NTSTATUS nt_status;
+
+ if (!text_list) {
+ DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
+ return nt_status;
+
+ for (;*text_list; text_list++) {
+ if (load_auth_module(*auth_context, *text_list, &t)) {
+ DLIST_ADD_END(list, t, auth_methods *);
+ }
+ }
+
+ (*auth_context)->auth_method_list = list;
+
+ return nt_status;
+}
+
+/***************************************************************************
+ Make a auth_context struct for the auth subsystem
+***************************************************************************/
+
+NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
+{
+ char **auth_method_list = NULL;
+ NTSTATUS nt_status;
+
+ if (lp_auth_methods()
+ && !str_list_copy(talloc_tos(), &auth_method_list,
+ lp_auth_methods())) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ if (auth_method_list == NULL) {
+ switch (lp_security())
+ {
+ case SEC_DOMAIN:
+ DEBUG(5,("Making default auth method list for security=domain\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest sam winbind:ntdomain",
+ NULL);
+ break;
+ case SEC_SERVER:
+ DEBUG(5,("Making default auth method list for security=server\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest sam smbserver",
+ NULL);
+ break;
+ case SEC_USER:
+ if (lp_encrypted_passwords()) {
+ if ((lp_server_role() == ROLE_DOMAIN_PDC) || (lp_server_role() == ROLE_DOMAIN_BDC)) {
+ DEBUG(5,("Making default auth method list for DC, security=user, encrypt passwords = yes\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(),
+ "guest sam winbind:trustdomain",
+ NULL);
+ } else {
+ DEBUG(5,("Making default auth method list for standalone security=user, encrypt passwords = yes\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest sam",
+ NULL);
+ }
+ } else {
+ DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest unix", NULL);
+ }
+ break;
+ case SEC_SHARE:
+ if (lp_encrypted_passwords()) {
+ DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest sam", NULL);
+ } else {
+ DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest unix", NULL);
+ }
+ break;
+ case SEC_ADS:
+ DEBUG(5,("Making default auth method list for security=ADS\n"));
+ auth_method_list = str_list_make(
+ talloc_tos(), "guest sam winbind:ntdomain",
+ NULL);
+ break;
+ default:
+ DEBUG(5,("Unknown auth method!\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+ } else {
+ DEBUG(5,("Using specified auth order\n"));
+ }
+
+ nt_status = make_auth_context_text_list(auth_context,
+ auth_method_list);
+
+ TALLOC_FREE(auth_method_list);
+ return nt_status;
+}
+
+/***************************************************************************
+ Make a auth_info struct with a fixed challenge
+***************************************************************************/
+
+NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8])
+{
+ NTSTATUS nt_status;
+ if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
+ return nt_status;
+ }
+
+ (*auth_context)->challenge = data_blob_talloc((*auth_context)->mem_ctx, chal, 8);
+ (*auth_context)->challenge_set_by = "fixed";
+ return nt_status;
+}
+
+
generated by cgit (git 2.34.1) at 2025-01-14 17:20:28 +0000